Installation, Operation and
Maintenance Manual
Oil Fired Warm Air Furnaces
O4HD-091A-12-FB (Up-Flow Model)
O4HD-091A-14-FA-DV (Up-Flow Model)
O4HD-091A-V-FA (Up-Flow Model with ECM)
FOR YOUR SAFETY:
Do not store or use gasoline or other flammable liquids or
vapors in the vicinity of this, or any other appliance.
ALL INSTALLATIONS MUST MEET ALL
LOCAL, PROVINCIAL/STATE, AND
FEDERAL CODES WHICH MAY
DIFFER FROM THIS MANUAL
NORDYNE INC.
Read this complete manual before
beginning installation. These instructions
must be kept with the furnace for future
reference.
151B-0909
2
TABLE OF CONTENTS
1. INTRODUCTION .................................................................................................................................3
2. HEAT LOSS........................................................................................................................................3
3. LOCATION OF UNIT..........................................................................................................................3
4. AIR CONDITIONING APPLICATIONS ...............................................................................................4
5. COMBUSTION AIR.............................................................................................................................4
6. CHIMNEY VENTING ...........................................................................................................................4
7. BAROMETRIC DAMPER CONTROL.................................................................................................4
8. OPTIONAL SIDE WALL VENTING.....................................................................................................5
9a, 9b. FAN TIMER BOARD AND LIMIT CONTROL (FIGURE 4 AND 5) .............................................5
10. ELECTRICAL CONNECTIONS.........................................................................................................5
11. HUMIDIFIER......................................................................................................................................6
12. PIPING INSTALLATION ...................................................................................................................6
13. OIL FILTER.......................................................................................................................................6
14. OIL BURNER NOZZLES...................................................................................................................6
15. OIL BURNER ADJUSTMENT...........................................................................................................6
16. BURNER ELECTRODES..................................................................................................................7
17. BURNER PRIMARY (SAFETY) CONTROL......................................................................................7
18. COMBUSTION CHAMBER...............................................................................................................7
19a, 19b. CIRCULATING AIR BLOWER................................................................................................7
20. MAINTENANCE AND SERVICE.......................................................................................................8
21. OPERATING INSTRUCTIONS..........................................................................................................9
22. ECM BLOWER MOTOR OPERATION
….…………………………………………………...……………9
APPENDIX A- O4HD-091A-12-FB, O4HD-091A-14-FA-DV AND O4HD-091A-V-FA...........................11
A.1 OIL BURNER AIR ADJUSTMENT..................................................................................................12
A.2 BURNER ELECTRODES ................................................................................................................12
A.3 START UP.......................................................................................................................................12
APPENDIX B: WIRING DIAGRAMS......................................................................................................17
OPERATION OF OIL BURNER.............................................................................................................19
APPENDIX C OIL PRIMARY CONTROL DETAILED SEQUENCE OF OPERATION .........................20
OIL PRIMARY CONTROL LED DIAGNOSTIC LIGHT..........................................................................24
FINAL CHECK OUT...............................................................................................................................30
HOMEOWNER’S REFERENCE TABLE................................................................................................31
PARTS LISTING: HIGHBOY MODEL: O4HD-091A-12-FB, O4HD-091A-14-FA-DV, AND
O4HD-091A-V-FA ..................................................................................................................................32
NOTES: ..................................................................................................................................................................35
IMPORTANT:
SAVE THESE INSTRUCTIONS FOR FUTURE REFERENCE
1. INTRODUCTION
Please read these instructions completely and carefully
before installing and operating the furnace.
MODELS O4HD-091A-12-FB, O4HD-091A-14-FA-
DV, AND O4HD-091A-V-FA
Models O4HD-091A-12-FB, O4HD-091A-14-FA-DV and
O4HD-091A-V-FA are oil fired forced air up-flow furnaces
with an output capacity range of 59,000 BTU/Hr. to
86,000 BTU/Hr.
DO NOT USE GASOLINE, CRANK CASE OIL, OR
ANY OIL CONTAINING GASOLINE.
All models are CSA listed, (NRTL/C) for use with No. 1
(Stove) and No. 2 (Furnace) Oil. Please refer to the
tables in Appendix A for performance and dimensional
data.
In Canada, the installation of the furnace and related
equipment shall be installed in accordance with the
regulations of CAN/CSA - B139, Installation Code for Oil-
Burning Equipment, as well as in accordance with local
codes.
In the United States of America, the installation of the
furnace and related equipment shall be installed in
accordance with the regulations of NFPA No. 31,
Standard for the Installation of Oil-Burning Equipment
, as
well as in accordance with local codes.
Regulations prescribed in the National Codes and Local
regulations take precedence over the general
instructions provided on this installation manual. When in
doubt, please consult your local authorities.
All models are shipped assembled and pre-wired. The
furnace should be carefully inspected for damage when
being unpacked.
2. HEAT LOSS
The maximum hourly heat loss for each heated space
shall be calculated in accordance with the procedures
described in the manuals of the Heating, Refrigeration
and Air Conditioning Institute of Canada (HRAI), or by
other means prescribed, or approved by the local
authority having jurisdiction.
In the United States, Manual J. titled, "Load Calculation"
published by the Air Conditioning Contractors of
America, describes a suitable procedure for calculating
the maximum hourly heat loss.
3. LOCATION OF UNIT
The furnace should be located such that the flue
connection to the chimney is short, direct and
consists of as few elbows as possible. When
possible, the unit should be centralized with respect
to the supply and return air ductwork. A central
location minimizes the trunk duct sizing. All models
may be installed on combustible floors.
The minimum installation clearances are listed in
Table 1.
Table 1: Clearances – (Inches)
Clearance to Combustibles
O4HD-091A-12-FB, O4HD-
091A-14-FA-DV and O4HD-
091A-V-FA
Location
Up flow
Top 1
Bottom 0
S/A Plenum 1
Rear 1
Sides 1
Front 1**
Flue Pipe 9*
Enclosure Closet
*18 in. in USA
** 24 in. required for service clearance
HEAT EXCHANGER SUPPORT SCREWS
Before final placement of the furnace, the heat
exchanger support screws shown in the picture may
be removed. This may be preferable if the furnace
rear panel will be inaccessible after installation. The
screws must be removed if the heat exchanger must
be removed from the cabinet.
3
4. AIR CONDITIONING APPLICATIONS
If the furnace is used in conjunction with air conditioning,
the furnace shall be installed in parallel with or upstream
from the evaporator coil to avoid condensation in the
heat exchanger. In a parallel installation, the dampers or
air controlling means must prevent chilled air from
entering the furnace. If the dampers are manually
operated, there must be a means of control to prevent
the operation of either system unless the dampers are in
the full heat or full cool position. The air heated by the
furnace shall not pass through a refrigeration unit unless
the unit is specifically approved for such service.
The blower speed must be checked and adjusted to
compensate for the pressure drop caused by the
evaporator coil. Refer to Appendix B for recommended
wiring and electrical connections of the air conditioning
controls.
5. COMBUSTION AIR
If the furnace is installed in a closet or utility room, two
openings must be provided connecting to a well-
ventilated space (full basement, living room or other
room opening thereto, but not a bedroom or bathroom).
One opening shall be located above the level of the
upper vent opening and one opening below the
combustion air inlet opening in the front of the furnace.
Each opening shall have a minimum free area of 1½
square inches per 1,000 Btu/h of total input rating of all
appliances installed in the room.
For furnaces located in buildings of unusually tight
construction, such as those with high quality weather
stripping, caulking, windows and doors, or storm sashed
windows, or where basement windows are well sealed, a
permanent opening communicating with a well ventilated
attic or with the outdoors shall be provided, using a duct
if necessary. The duct opening shall have a free area of
1½ square inches per 1,000 Btu/h of total input rating of
all appliances to be installed. When a furnace is installed
in a full basement, infiltration is normally adequate to
provide air for combustion and draft operation. Furnace
rooms under 65m³ (700 ft³) should automatically be
treated as confined space.
6. CHIMNEY VENTING
The flue pipe should be as short as possible with
horizontal pipes sloping upward toward the chimney at a
rate of one-quarter inch to the foot. The flue pipe should
not be smaller in cross sectional area than the flue collar
on the furnace. The flue pipe should connect to the
chimney such that the flue pipe extends into, and
terminates flush with the inside surface of the chimney
liner. Seal the joint between the pipe and the lining. The
chimney outlet should be at least two feet above the
highest point of a peaked roof. All unused chimney
openings should be closed. Chimneys must conform to
local, provincial or state codes, or in the absence of local
regulations, to the requirements of the National
Building Code.
NOTE: THE FURNACE IS APPROVED FOR
USE WITH TYPE L VENT OR EQUIVALENT.
CHIMNEY VENTED VERSIONS OF THE
FURNACE MUST BE CONNECTED TO A
FLUE HAVING SUFFICIENT DRAFT AT ALL
TIMES TO ENSURE SAFE AND PROPER
OPERATION OF THE APPLIANCE.
NOTE: THE RECOMMENDED FLUE DRAFT
PRESSURE IS -0.02 IN. W.C. (SEE FIG 2.)
The flue pipe must not pass through any floor or
ceiling, but may pass through a wall where suitable
fire protection provisions have been installed. Refer
to the latest edition of CAN/CSA B-139 for rules
governing the installation of oil burning equipment.
In the United States, refer to the latest edition of
NFPA 31 for regulations governing the installation of
oil burning equipment.
See appendix A for burner set-up.
Fig. 2: Checking Over-Fire Draft.
Over-fire draft access port.
7. BAROMETRIC DAMPER CONTROL.
The barometric damper control, also known as a
draft regulator, is used on conventional chimney
venting only. This control automatically maintains a
constant negative pressure in the furnace to obtain
maximum efficiency. It ensures that proper
pressures are not exceeded. If the chimney does not
develop sufficient draft, the draft control cannot
4
function properly. The draft regulator, when installed
should be in the same room or enclosure as the furnace
and should not interfere with the combustion air supplied
to the burner. The control should also be located near
the furnace flue outlet and installed according to the
instructions supplied with the regulator. The flue outlet
pressure (measured between the furnace and draft
regulator, or the oil burner mounting plate over-fired draft
access port. fig. 2) should be set to -0.02 in. w.c.
8. OPTIONAL SIDE WALL VENTING
O4HD-091A-14-FA-DV furnace models are
manufactured to be installed as sidewall vented units.
Please refer to Direct Venting Instructions, P/N
240006979 included with the Vent Kit for details. Sidewall
Venting (Direct Venting) requires the use of a specific oil
burner; the Beckett AFII. Please refer to Appendix A,
Table A2.
Note: Sidewall venting requires special attention to
combustion air supply. There is no natural draft in the
venting system between furnace cycles; therefore, if the
indoor pressure is negative relative to the outdoors, the
vent terminal becomes a point of infiltration. This could
lead to oil odour control problems. This problem is
rectified by the use of ducted outdoor air for combustion
(semi-sealed combustion), using the Beckett AFII oil
burner. See Direct Vent Instructions supplied with the
Vent Kits.
9a. FAN TIMER BOARD AND LIMIT CONTROL
(FIG. 4) (page 22)
The Electronic Fan Timer integrates control of all burner
and circulator fan operations. This control is the central
wiring point for most of the electrical components in the
furnace. The United Technologies 1158-120 (O4HD-
091A-12-FB and O4HD-091A-14-FA-DV) has an
adjustable fan on time that is set by selecting the
dipswitch combination displayed in Chart 1. This fan on
delay can be set at 1, 2, 4 or 6 minutes. This provides a
delay between the burner ignition and blower start-up to
eliminate excessive flow of cold air when the blower
comes on. The United Technologies 1158-120 (O4HD-
091A-12-FB and O4HD-091A-14-FA-DV) has an
adjustable fan off time of 30, 60, 90 or 120 seconds
displayed in Chart 1. The fan off delay time starts when
the burner motor is de-energized at the end of a call for
heat. Blower shutdown is delayed to remove any residual
heat from the heat exchanger and improve the annual
efficiency of the furnace.
The electronic fan timer board works in conjunction with
snap disc limit controls, which perform a safety function,
and breaks power to the oil burner primary control, which
shuts off the burner if the furnace over-heats. The limit
control is thermally operated and automatically resets.
The limit control is factory installed, pre-set and is not
adjustable.
If the limit control opens with the United
Technologies 1158-120 (O4HD-091A-12-FB and
O4HD-091A-14-FA-DV) electronic fan control, the
circulating fan will be energized as well. When the
limit closes, the fan off timer will begin. At the end of
the fan off time cycle the burner will be energized,
initiating a normal burner cycle.
CHART 1
United Technologies 1158-120 (O4HD-091A-
12-FB and O4HD-091A-14-FA-DV)
Dip Switch Position Blower Delay Times
1 2 3 4 On
Seconds
Off
Minutes
Off Off 30
On Off 60
Off On 90
On On 120
Off Off 1
On Off 2
Off On 4
On On 6
9b. FAN TIMER BOARD AND LIMIT
CONTROL (FIG. 5) (page 22)
The United Technologies 1168-1 ECM (O4HD-
091A-V-FA) tap board has an adjustable fan on/off
delay that must be adjusted in accordance with the
furnace input rating (nozzle size). Refer to Table A-
10 (pg 15) for ECM blower set-up.
10. ELECTRICAL CONNECTIONS
The furnace is listed by the Canadian Standards
Association under the NRTL (North American)
Standard. It is factory wired and requires minimal
field wiring. All field wiring should conform to
CAN/CSA C22.1 Canadian Electrical Code, Part 1,
and by local codes, where they prevail. In the United
States, the wiring must be in accordance with the
National Fire Protection Association NFPA-70,
National Electrical Code, and with local codes and
regulations.
The furnace should be wired to a separate and
dedicated circuit in the main electrical panel;
however, accessory equipment such as electronic
air cleaners and humidifiers may be included on the
furnace circuit. Although a suitably located circuit
breaker can be used as a service switch, a separate
service switch is advisable. The service switch is
necessary if reaching the circuit breaker involves
becoming close to the furnace, or if the furnace is
located between the circuit breaker and the means
of entry to the furnace room. The furnace switch
5
4. AIR CONDITIONING APPLICATIONS
If the furnace is used in conjunction with air conditioning,
the furnace shall be installed in parallel with or upstream
from the evaporator coil to avoid condensation in the
heat exchanger. In a parallel installation, the dampers or
air controlling means must prevent chilled air from
entering the furnace. If the dampers are manually
operated, there must be a means of control to prevent
the operation of either system unless the dampers are in
the full heat or full cool position. The air heated by the
furnace shall not pass through a refrigeration unit unless
the unit is specifically approved for such service.
The blower speed must be checked and adjusted to
compensate for the pressure drop caused by the
evaporator coil. Refer to Appendix B for recommended
wiring and electrical connections of the air conditioning
controls.
5. COMBUSTION AIR
If the furnace is installed in a closet or utility room, two
openings must be provided connecting to a well-
ventilated space (full basement, living room or other
room opening thereto, but not a bedroom or bathroom).
One opening shall be located above the level of the
upper vent opening and one opening below the
combustion air inlet opening in the front of the furnace.
Each opening shall have a minimum free area of 1½
square inches per 1,000 Btu/h of total input rating of all
appliances installed in the room.
For furnaces located in buildings of unusually tight
construction, such as those with high quality weather
stripping, caulking, windows and doors, or storm sashed
windows, or where basement windows are well sealed, a
permanent opening communicating with a well ventilated
attic or with the outdoors shall be provided, using a duct
if necessary. The duct opening shall have a free area of
1½ square inches per 1,000 Btu/h of total input rating of
all appliances to be installed. When a furnace is installed
in a full basement, infiltration is normally adequate to
provide air for combustion and draft operation. Furnace
rooms under 65m³ (700 ft³) should automatically be
treated as confined space.
6. CHIMNEY VENTING
The flue pipe should be as short as possible with
horizontal pipes sloping upward toward the chimney at a
rate of one-quarter inch to the foot. The flue pipe should
not be smaller in cross sectional area than the flue collar
on the furnace. The flue pipe should connect to the
chimney such that the flue pipe extends into, and
terminates flush with the inside surface of the chimney
liner. Seal the joint between the pipe and the lining. The
chimney outlet should be at least two feet above the
highest point of a peaked roof. All unused chimney
openings should be closed. Chimneys must conform to
local, provincial or state codes, or in the absence of local
regulations, to the requirements of the National
Building Code.
NOTE: THE FURNACE IS APPROVED FOR
USE WITH TYPE L VENT OR EQUIVALENT.
CHIMNEY VENTED VERSIONS OF THE
FURNACE MUST BE CONNECTED TO A
FLUE HAVING SUFFICIENT DRAFT AT ALL
TIMES TO ENSURE SAFE AND PROPER
OPERATION OF THE APPLIANCE.
NOTE: THE RECOMMENDED FLUE DRAFT
PRESSURE IS -0.02 IN. W.C. (SEE FIG 2.)
The flue pipe must not pass through any floor or
ceiling, but may pass through a wall where suitable
fire protection provisions have been installed. Refer
to the latest edition of CAN/CSA B-139 for rules
governing the installation of oil burning equipment.
In the United States, refer to the latest edition of
NFPA 31 for regulations governing the installation of
oil burning equipment.
See appendix A for burner set-up.
Fig. 2: Checking Over-Fire Draft.
Over-fire draft access port.
7. BAROMETRIC DAMPER CONTROL.
The barometric damper control, also known as a
draft regulator, is used on conventional chimney
venting only. This control automatically maintains a
constant negative pressure in the furnace to obtain
maximum efficiency. It ensures that proper
pressures are not exceeded. If the chimney does not
develop sufficient draft, the draft control cannot
6
BEFORE OPERATING THE FURNACE CHECK
BURNER ALIGNMENT WITH COMBUSTION
CHAMBER. THE END CONE OF THE AIR TUBE
MUST BE CENTRED TO THE ACCOMODATING
RING PROVIDED IN THE DESIGN OF THE
COMBUSTION CHAMBER. ADJUST AS
NECESSARY.
16. BURNER ELECTRODES
Correct positioning of the electrode tips with respect to
each other, to the fuel oil nozzle, and to the rest of the
burners is essential for smooth light ups and proper
operation. Refer to the oil burner instructions shipped
with the furnace for electrode specifications.
NOTE: Beckett AF Series Burner electrode specifications
have been revised. They should be adjusted to be 5/16”
above the nozzle centerline.
17. BURNER PRIMARY (SAFETY) CONTROL
The furnace is equipped with a primary combustion
control, sometimes referred to as the burner relay or
burner protector relay, which uses a light sensing device
(cad cell) located in the burner housing, to monitor and
control combustion. Over time, dust or combustion
residuals can build up on the lens of the cad cell
impairing its response to the flame. The cad cell should
be checked for cleanliness and proper alignment if the
primary control frequently shuts down combustion.
ALL FURNACE CONTROLS ARE SENSITIVE
AND SHOULD NOT BE SUBJECTED TO
TAMPERING. IF PROBLEMS PERSIST, CALL
YOUR SERVICE CONTRACTOR.
18. COMBUSTION CHAMBER
This furnace is equipped with a high quality cerafelt
combustion chamber. It is held in place by a retaining
bracket.
CHECK THE ALIGNMENT OF THE COMBUSTION
CHAMBER AND OIL BURNER BEFORE FIRING.
IT IS POSSIBLE FOR THE COMBUSTION
CHAMBER TO SHIFT IF SUBJECTED TO ROUGH
HANDLING DURING TRANSIT.
The combustion
chamber should be inspected for damage or carbon build
up whenever the oil burner is removed for repairs or
routine maintenance.
DO NOT START THE BURNER UNLESS THE
BLOWER ACCESS DOOR IS SECURED IN
PLACE.
19a. CIRCULATING AIR BLOWER (O4HD-
091A-12-FB)
The O4HD-091A-12-FB, O4HD-091A-14-FA-DV and
O4HD-091A-V-FA furnace models are equipped
with direct drive blower systems. O4HD-091A-12-
FB and O4HD-091A-14-FA-DV models are
equipped with PSC motors; O4HD-091A-V-FA
models are equipped with electronically commutated
motors (ECM). Direct drive blower speed
adjustments are not normally required in properly
sized extended plenum duct systems. The motor
RPM and air CFM delivery will vary automatically to
accommodate conditions within the usual range of
external static pressures typical of residential duct
systems. Under-sized duct systems may require a
higher blower speed to obtain a reasonable system
temperature rise. Some older duct systems were not
designed to provide static pressure. They typically
feature special reducing fittings at each branch run
and lack block ends on the trunk ducts. These
systems may require modification to provide some
resistance to the airflow to prevent over-amping of
the direct drive blower motor. Selecting a lower
blower speed may correct this problem. Direct drive
blower speeds are adjusted by changing the "hot"
wires to the motor winding connections. Please refer
to wiring diagrams in Appendix B or the wiring
diagram label affixed to the furnace. THE NEUTRAL
WIRE (normally the white wire) IS NEVER
MOVED TO ADJUST THE BLOWER SPEED.
It is possible and acceptable to use a single blower
speed for both heating and cooling modes. The
simplest method to connect the wiring from both
modes is to use a "piggy-back connector"
accommodating both wires on a single motor tap. It
is also acceptable to connect the selected motor
speed with a pigtail joined to both heating and
cooling speed wires with a wire nut. As a safety
precaution against accidental disconnection of the
wires by vibration, it is advisable to secure the wire
nut and wires with a few wraps of electricians tape.
7
DO NOT CONNECT POWER LEADS BETWEEN
MOTOR SPEEDS. THE NEUTRAL WIRE MUST
ALWAYS BE CONNECTED TO THE MOTOR'S
DESIGNATED NEUTRAL TERMINAL.
If the joining of the blower speed wiring is done in the
furnace junction box, tape off both ends of the unused
wire.
Do not use the blower speed wires as a source of
power to accessories as electronic air cleaners and
humidifier transformers. The unused motor taps auto-
generate sufficiently high voltages to damage accessory
equipment.
DISCONNECT THE POWER SUPPLY TO THE
FURNACE BEFORE OPENING THE BLOWER
ACCESS DOOR TO SERVICE THE AIR FILTER,
FAN AND MOTOR. FAILURE TO SHUT OFF
POWER COULD ALLOW THE BLOWER TO
START UNEXPECTEDLY, CREATING A RISK OF
DEATH OR PERSONAL INJURY.
19b. CIRCULATING AIR BLOWER (O4HD-091A-
V-FA) (See Section 22 Page 9)
20. MAINTENANCE AND SERVICE
Routine Maintenance By Home Owner
Other than remembering to arrange for the annual
professional servicing of the furnace by the service
or installation contractor, the most important routine
service performed by the homeowner is to maintain
the air filter or filters. A dirty filter can cause the
furnace to over-heat, fail to maintain indoor
temperature during cold weather, increase fuel
consumption and cause component failure.
The furnace filter(s) should be inspected, cleaned or
replaced monthly. The furnace is factory equipped
with a semi-permanent type filter. If the filter is
damaged, replace with filters of the same size and
type. (See Appendix A, Table A-8).
During the routine service, inspect the general
condition of the furnace watching for signs of oil
leaks in the vicinity of the oil burner, soot forming on
any external part of the furnace, soot forming around
the joints in the vent pipe, etc. If any of these
conditions are present, please advise your service
or installation contractor.
Annual Service By Contractor
THE COMBUSTION CHAMBER (FIREPOT) IS
FRAGILE. USE CARE WHEN INSPECTING
AND CLEANING THIS AREA.
The heat exchanger should be inspected
periodically and cleaned if necessary. If cleaning is
necessary, SHUT OFF POWER TO THE FURNACE
and remove the burner. Using a stiff brush with a
wire handle, brush off scale and soot from inside the
drum and flue pipe. To clean the radiator, remove
the clean-out caps screws, and remove the caps
carefully to avoid tearing the gaskets. A wire brush
can be used to loosen dirt and debris on the inside
surfaces of the radiator. Clean out all accumulated
dirt, soot and debris with a wire handled brush and
an industrial vacuum cleaner. Before replacing the
clean-out caps, inspect the gaskets. If the gaskets
are broken, remove the remnants and replace with
new gaskets.
The blower motor is factory oiled and permanently
sealed. DO NOT LUBRICATE. Excess oil causes
premature electric motor failure.
Inspect the blower fan. Clean if necessary.
Oil Burner Maintenance: Follow the instructions of
the oil burner manufacturer. (See oil burner
manufacturer's instructions supplied with furnace or
burner). It is advisable to change the oil burner
nozzle and oil filter on an annual basis.
8
The venting system should be cleaned and inspected for
signs of deterioration. Replace pitted or perforated vent
pipe and fittings. The barometric damper should open
and close freely.
All electrical connections should be checked to ensure
tight connections. Safety controls such as the high limit
controls should be tested for functionality. The fan control
should be checked to ensure that the fan on and off
delay function continues to start and stop the blower fan
at the optimal settings.
21. OPERATING INSTRUCTIONS (O4HD-091A-
12-FB AND O4HD-091A-14-FA-DV)
Before Lighting
Open all supply and return air registers and grilles.
Open all valves in oil pipes.
Turn on electric power supply
To Light Unit
Set the thermostat above room temperature to call for
heat. The burner should start. NOTE: It may be
necessary to press the RESET button on the primary
combustion control relay.
There will be a fan on time delay before the circulating
fan is energized. The United Technologies 1158-120
has an adjustable fan on time that is set by selecting the
dipswitch combination displayed in Chart 1. This fan on
delay can be set at 1, 2, 4 or 6 minutes.
Set the thermostat below room temperature. The oil
burner should stop.
The air circulation blower will continue to run until the
time off setting selected on the electronic fan timer
control times out. The United Technologies 1158-120
has an adjustable fan off time of 30, 60, 90 or 120
seconds. The fan timer control adjustments may be
altered if the air at the room registers is uncomfortably
high upon blower start up or shutdown.
The necessary adjustments to the fan control settings
should be determined by measuring the temperature of
the air in the supply air take-off, or within the first few
inches of the supply air trunk. The side mid point of the
transition is usually ideal, providing that the thermometer
probe is beyond the "line of sight" wherein false readings
from radiant heat could be observed. System
temperature rise is the difference in temperature
between the supply air and return air.
To check the operation of the limit switch, shut off power
to the furnace. Temporarily remove the neutral wire from
the direct drive blower motor. Restore the electrical
power to the furnace and set the thermostat above room
temperature.
After three or four minutes of burner operation, the limit
control should turn the burner off. When the limit function
test is complete, shut off electrical power to the
furnace, replace the neutral wire to the blower fan
motor, and then restore power. The blower fan will
start up immediately. Once the temperature has
dropped and the limit control has reset, the fan will
operate until the fan off time is achieved. The oil
burner will then resume operation and continue until
the thermostat is satisfied. Restore the thermostat
setting to a comfortable temperature.
To Shut Down Unit
Set the thermostat to the lowest possible setting.
Set the manual switch (if installed) in the Electrical
Power Supply Line to "OFF".
21. OPERATING INSTRUCTIONS (O4HD-
091A-V-FA)
Before Lighting
Open all supply and return air registers and grilles.
Open all valves in oil pipes.
Turn on electric power supply
To Light Unit
Set the thermostat above room temperature to call
for heat. The burner should start. NOTE: It may be
necessary to press the RESET button on the
primary combustion control relay.
There will be a fan on time delay before the
circulating fan is energized. The United
Technologies 1168-1 has an adjustable fan on/off
time delay that is programmed into the ECM motor,
and is set by selecting the SW4 DIP switch
combination displayed in Table A-10 page 15. Fan
on/off delay must be adjusted according to input
(nozzle size).
1. Set the thermostat below room temperature. The
oil burner should stop.
The air circulation blower will continue to run until
the blower off delay setting programmed into the
ECM motor times out.
To check the operation of the limit switch, shut off
power to the furnace. Temporarily remove the 5 pin
power connector plug from the ECM blower motor.
NOTE: Isolate the AC Line pins on the 5 pin
power connector with electrical tape to prevent
electric shock hazard. Restore the electrical
power to the furnace and set the thermostat above
room temperature.
After three or four minutes of burner operation, the
limit control should turn the burner off. When the
limit function test is complete, shut off electrical
power to the furnace, replace the 5 pin power plug to
the blower fan motor, and then restore power. The
blower fan will start up immediately. Once the
9
temperature has dropped and the limit control has reset,
the fan will operate until the fan off time is achieved. The
oil burner will then resume operation and continue until
the thermostat is satisfied. Restore the thermostat setting
to a comfortable temperature.
22. ECM BLOWER MOTOR OPERATION
(O4HD-091A-V-FA)
Setting Blower “ON” and “OFF” Timings
Blower on/off time delays are handled by ECM
motor programming. Features of this ECM variable
speed motor are that it will deliver a constant airflow
within a wide range of external static pressures, and
also includes:
NOTE: IF THE FURNACE IS TO BE SHUT DOWN
FOR AN EXTENDED PERIOD OF TIME, CLOSE
THE OIL SUPPLY VALVE TO THE BURNER.
Soft Start: This ECM variable speed motor will
slowly ramp up to the required operating speed.
This feature in the heating cycle allows the heat
exchanger to reach operating temperature before
the set heat speed, which minimizes noise and
increases comfort.
DO NOT ATTEMPT TO START THE BURNER
WHEN EXCESS OIL HAS ACCUMULATED,
WHEN THE FURNACE IS FULL OF VAPOUR, OR
WHEN THE COMBUSTION CHAMBER IS VERY
HOT. NEVER BURN GARBAGE OR PAPER IN
THE FURNACE, AND NEVER LEAVE PAPER OR
RAGS AROUND THE UNIT.
Soft Stop: At the end of the heating cycle, the ECM
variable speed motor will slowly ramp down. This
feature allows for increased energy efficiency and
reduced noise levels.
Dehumidification: A dehumidification feature has
been programmed into the variable speed motor. At
the start of each cooling cycle, the variable speed
motor will run at 82% of the rated airflow for 7.5
minutes. After 7.5 minutes has elapsed, the motor
will increase to 100% of the rated airflow. This
profile is used to provide dehumidification and
improve system efficiency.
Continuous Fan Operation: When the thermostat
continuous fan (G) switch is on without a call for
heating or cooling, the indoor fan is immediately
energized up to 50% of the cooling speed. This
feature allows continuous circulation of air between
calls for heating or cooling.
If a call for heat (W) or cool (Y) occurs during
continuous fan, the blower will remain energized
10
Appendix A- O4HD-091A-12-FB, O4HD-091A-14-FA-DV AND O4HD-091A-V-FA
O4HD-091A-12-FB, O4HD-091A-14-FA-DV and O4HD-091A-V-FA furnaces may be used with the following oil
burners.
Please note: The Beckett AF oil burner is for applications using indoor air for combustion only. For sidewall
venting applications utilizing outdoor air for combustion, use the Beckett AFII (Balanced Flue) oil burner only.
Table A-1 Beckett AF Oil Burner Set-Up
Beckett AF Series Oil Burners
(For use with chimney vented units only)
Furnace Model
Output
BTU/Hr
Burner
Model
Nozzle
Pump
Pressure
Flow
Rate
Head
1
Static
Plate
O4HD-070A-12-FB
2
O4HD-070A-V-FA ²
59,000 AF76BNHS
0.50 /
80°A
100 psig
0.50
usgph
F3 3- ⅜ in.
O4HD-091A-12-FB
O4HD-091A-12-FB
76,000 AF76BNHS
0.65 /
80°A
100 psig
0.65
usgph
F3 3- ⅜ in.
O4HD-105A-12-FB
O4HD-105A-12-FB
86,000 AF76BNHS
0.75 /
80°A
100 psig
0.75
usgph
F3 3- ⅜ in.
1
Head is shielded by ceramic insulator.
2
Low Firing Rate Baffle required when using a 0.50-gallon
nozzle. Bold models indicate the factory equipped firing rate.
Table A-2 Beckett AFII Oil Burner Set-Up
Beckett AFII Series Oil Burners
(For use with sidewall vented units with outdoor combustion air, or chimney vented units with
indoor air for combustion)
Furnace Model Output BTU/Hr
Burner
Model
Nozzle
Pump
Pressure
Flow
Rate
Head
O4HD-070-14-FA-DV 65,000 AFII-85
0.50 /
60°A
120 psig
0.55
usgph
FB0
O4HD-091-14-FA-DV 75,000 AFII-85
0.60 /
60°A
115 psig
0.65
usgph
FB3
O4HD-105A-14-FA-DV 86,000 AFII-85
0.70 /
60°A
115 psig
0.75
usgph
FB3
11
12
NOTE: Air gate setting may vary for sidewall vented units where air gate must be adjusted to achieve
zero smoke.
A.1 OIL BURNER AIR ADJUSTMENT
For complete details, consult the oil burner instruction
manual provided in the furnace documents envelope.
Beckett AF Burner
Adjust the air shutter by loosening the locking screws
and moving the air shutter, and if necessary, the bulk
air band.
Beckett AFII Burner
Adjust the burner air supply by first loosening the
locking screw located on the black dial to the right of
the burner. Turn the black dial clockwise to increase
the combustion air and counter-clockwise to decrease
the combustion air. Re-tighten the locking screw after
obtaining the proper setting.
A.2 BURNER ELECTRODES
Adjustment of the electrode tips with respect to each
other, the nozzle, and to the rest of the burner is very
important to ensure smooth start-ups and to permit
efficient combustion.
Beckett AF Burner
Electrode gap: 5/32 inch.
Distance above horizontal centerline: 5/16 inch. Older
instruction sheets specify 7/16 inch. The current
specification is 5/16 inch.
Distance ahead of nozzle: 1/16 inch.
“Z” dimension, the distance from the front of the end
cone (head) to the face of the nozzle should be 1-1/8
inches. If a ceramic head is used, the distance from
the end cone to the nozzle face is increased to 1-3/8
inches.
A.3 START UP
The furnace should be operated for a minimum of 10
minutes to reach steady state conditions before fine
tuning combustion. The warm up time is ideal for
testing the oil pump pressure.
Drill a 1/4-inch test port in the venting between the
furnace flue outlet and draft regulator (barometric
damper). Insert a stack thermometer and note the flue
gas temperature. The flue gases should be within a
range of 350°F to 450°F. If the flue gases are below
the range, it may be necessary to slow down the
blower fan. If the flue gases are above the range, the
blower fan may require speeding up. Stack
temperature varies directly with the system
temperature rise. System temperature rise is the
difference between the furnace outlet temperature and
furnace inlet temperature as measured in the vicinity of
the connection between the plenum take-offs and the
trunk ducts. Temperature rise value is listed on the
system rating plate.
Perform a smoke spot test. The smoke spot should not
exceed No. 1 on the Bacharach Scale.
After the air adjustments have been completed, re-
check the draft pressure at the test port on the burner
mounting plate as shown in Figure 2. The draft should
be adjusted to -0.02 inches w.c.
In the United States, the Beckett AF Burner may be
equipped with Beckett's "Inlet Air Shut-Off" to increase
efficiency. (Beckett Part No. AF/A 5861).
NOTE: USE OF THE INLET AIR SHUT-OFF
COULD CAUSE POST COMBUSTION NOZZLE
DRIP.
Table A-6 Direct Drive Blower Set-Up PSC Motor
Blower Set-Up Cooling Capacity
0.20 in. w.c. 0.50 in. w.c.
Furnace Model Blower
Speed Motor Speed Motor
Tons Power
CFM
Range
O4HD-070A-12-FB
O4HD-070A-14-FA-DV
100-10T
DD Low 1/2 HP Med-Low 1/2 HP 3 1/2 HP 690 – 1500
O4HD-091A-12-FB
O4HD-091A-14-FA-DV
100-10T
DD Med-Low 1/2 HP Med-High 1/2 HP 3 1/2 HP 690 – 1500
O4HD-105A-12-FB
O4HD-105A-14-FA-DV
100-10T
DD
Med-
High 1/2 HP High 1/2 HP 3 1/2 HP 690 – 1500
Table A-7 Direct Drive Blower Characteristics PSC Motor
CFM
External Static Pressure – Inches w.c.
Furnace Model Blower
Motor
HP
Motor
FLA
∆T
Speed
0.2 0.3 0.4 0.5 0.6
High 1741 1651 1556 1476 1369
O4HD-A-12-FB
O4HD-14-FA-DV
Med-
High
1557 1497 1434 1369 1278
Med-
Low
1063 1051 1037 1037 1011
070-105
100-10T
DD
1/2 HP 7 60°F
Low 697 697 687 672 646
13
Table A-8 Direct Drive Blower Characteristics ECM Motor
CFM RANGE
Continuous Heating Cooling
Furnace Model Blower
Motor
HP
Motor
FLA
∆T
Fan
0.28 - 0.48
inches w.c.
0.5 inches
w.c.
O4HD-070A-V-FA
O4HD-091A-V-FA
O4HD-105A-V-FA
100-10
DD
1/2 HP
ECM
7.7 60°F 500 - 700 825 - 1250 600 - 1400
14
Table A-9 General Dimensions (Inches)
Cabinet Plenum Openings Filter
Shipping
Weight
Return (LB.)
Furnace Model Width Depth Height Supply
Side Bottom
Flue
Diameter Type Size
O4HD-A-12-FB
O4HD-A-14-FA-DV
070-105
22 30 -3/4 49-5/8 20½ x 20 14 x 22 14 x 22 5 Permanent
16 x 25
x 1 210
15
16
SW1 (HEAT) AND SW4 (DELAY) DIP SWITCHES MUST BOTH BE ADJUSTED ACCORDING TO INPUT (NOZZLE SIZE).
NOTE:
Table A-10 ECM Blower Set-Up (O4HD-091A-V-FA)
DIP SWITCH ADJUSTMENT CHART
FOR INPUT 0.50 USGPH TO 0.75 USGPH
SW1 - HEAT SW2 - COOL
DIP Switch
Position
SW2 (COOL): 1 TON is approximately equal to 400 CFM
SW3 (ADJUST): (Heating Mode) Increase OR decrease temperature rise respectively
(Cooling Mode) Increase OR decrease CFM respectively
INPUT DIP Switch Position AC Size
1 2
POS.
USGPH 1 2
POS.
(TON)
OFF OFF A 0.65 OFF OFF A 3
ON OFF B N/A ON OFF B 2.5
OFF ON C 0.75 OFF ON C 2
ON ON D 0.50 ON ON D 1.5
SW3 - ADJUST SW4 - DELAY
DIP Switch
Position CFM DIP Switch Position INPUT
1 2
POS.
1 2
POS.
USGPH
OFF OFF A 0% OFF OFF A 0.65
ON OFF B (+)15% ON OFF B N/A
OFF ON C (-)15% OFF ON C 0.75
ON ON D N/A ON ON D 0.50
APPENDIX B: WIRING DIAGRAMS
1168-1
CONTROL
1158-1
CONTROL
CONTROL
1168-1
CONTROL
1158-1
THERMOSTAT CONNECTIONS/
raccorde du thermostat
THERMOSTAT CONNECTIONS/
raccorde du thermostat
YL
L1
BECKETT OIL
PRIMARY
CONTROL
T
3T
WH
BK
WH
43213
moteur
L1
N
MOTOR
BLOWER
ventilateur
INDOOR
12
CONT
EAC
HEAT
COOL
BK
BURNER
principale
UNUSED
MOTOR
ECM MOTOR
(IF AVAILABLE)
ventilateur a ECM
(si disponible)
BLOWER
principale
ventilateur
INDOOR
BELT DRIVE MOTOR
(IF AVAILABLE)
ventilateur a courroie
(si disponible)
(IF AVAILABLE)/(si disponible)
(disjoincteur avec fusible sur le fil d'alimentation)
alimentation 120 VAC 60Hz
POWER SUPPLY 120 VAC 60 HZ
(FUSED DISCONNECT ON HOT LEG)
L1
transformateur
V
I
V
V
VALVE/
soupappe
I
IGNITER/
transformateur d'allumage
BURNER MOLEX
CONNECTOR/
connecteur molex
du brûleur
interrompée
MOTOR
moteur
MOTOR
moteur
MOTOR
moteur
INDOOR
principale
ventilateur
BLOWER
BVS
(requis pourles installations au Canada)
commande d'épreuve de système d'évacuation bloqué
L
F
interupteur a basse vitesse (si équippée)
AL
limite auxiliaire - si équippée
(REQUIRED FOR CANADIAN INSTALLATIONS)
BLOCKED VENT SAFETY
L
BVS
RIELLO 40F BURNER/brûleur
BECKETT AF BURNER/brûleur
4
1
2
3
OR
BK
WH
VI
N
L
530SE
T2
1
2
WH
3
6
RD
RD
WH
WH
BK
BL
T1
WH
8
7
11
9
CAP
BR
BL
BK
BK
AL 1008
T (T2)
3T (T1)
YL
YL
BK
WH
OR
BL
VI
F
1
2
CAD
CELL
F
INTERRUPTED/
L1
L2
VALVE/soupappe
MOTOR/moteur
2
3
4
1
WH
BK
VI
VI
VI VIOLET/violet
GND GROUND/Terre
WH WHITE/blanc
YL YELLOW/jaune
CAP CAPACITOR/capaciteur
GR
COM
24V
24V
120V
BL
AL
RD
RD
21
4
3
WH
BK
4
3
2
1
OR
VI
BK
WH
YL
RD
BL
BK
WH
LOW SPEED FAN SWITCH (IF EQUIPPED)
LIMIT/limite
AUXILIARY LIMIT (IF EQUIPPED)
RD RED/rouge
OR ORANGE/orange
GR GREEN/vert
BR BROWN/brun
BL BLUE/bleu
BK BLACK/noir
N
30746 Rev A
ML
L
C
H
45213
MHI
TRANSFORMER/
120 V
24 V
24 V
120 V
TERMINAL NOT PROVIDED/point
de raccord non-fourni
GROUND/Terre
TERMINAL PROVIDED/
point de raccord fourni
FIELD WIRING
filage au champs
FACTORY WIRING
filage a l'usine
LEGEND/legende
F
C
X
HUM
7
6
COOL
HEAT
CONT
EAC
21
UNUSED
353421
MOTOR
BURNER
AL
YL
YL
GND
N (COMMON)
BK
WH
CAP
BR
BR
Chimney Vent Burner Wiring Diagram
O4HD-091A-12-FB O4HD-091A-V-
17
3
2
1
4
5
TO T2
TO T1
YL
VI
WH
RD
OR
BL
RD
BR
1
N
530SE
L
GY
3
2
RD
BK
7
6
YL
WH
9
8
WH
BR
12
11
RD
1
43
2
5
VI
RD
WH
V
WH
BK
VI
BK
RD
BL
TIMER
SWITCH
PRESSURE
N (COMMON)
TRANSFORMER/
transformateur
WH
L1
BR
BLOWER
INDOOR
principale
ventilateur
BR
moteur
MOTOR
ML
BK
54
H
312
MHI
CAP
C
L
24 V
120 V
24 V
FIELD WIRING
filage au champs
120 V
TERMINAL PROVIDED/
point de raccord fourni
GROUND/Terre
FACTORY WIRING
filage a l'usine
TERMINAL NOT PROVIDED/point
de raccord non-fourni
LEGEND/legende
CAP
BK
C
WH
VI
OR
NC
moteur
MOTOR
OR
BK
24V
24V
BL
YL
WH
BK
120V
COM
VI
VI RD
WH
5
1
2
34
T1
T2
BURNER MOLEX
CONNECTOR/
connecteur molex
du brûleur
X
YL
GR
C
HUM
12 435
7
EAC
CONT
HEAT
COOL
6
N
GND
T1
RD
F
WH
BK
BL
BK BLACK/noir
BL BLUE/bleu
GR GREEN/vert
BR BROWN/brun
OR ORANGE/orange
RD RED/rouge
L
AL
AUXILIARY LIMIT (IF EQUIPPED)
LIMIT/limite
limite auxiliaire - si équippée
CAP CAPACITOR/capaciteur
YL YELLOW/jaune
WH WHITE/blanc
GND GROUND/Terre
VI VIOLET/violet
MOTOR
3
UNUSED
BURNER
12
YL
F
IGNITER/
I
soupappe
VALVE/
V
L1
(FUSED DISCONNECT ON HOT LEG)
POWER SUPPLY 120 VAC 60 HZ
alimentation 120 VAC 60Hz
transformateur d'allumage
LOW SPEED FAN SWITCH (IF EQUIPPED)
interupteur a basse vitesse (si équippée)
321
L2
L1
WH
WH
RIELLO 40BF BURNER/brûleur
V
(IF AVAILABLE)/(si disponible)
BL
LIMIT
BL
OR
VI
I
moteur
F
F
YL
FLAME SENSOR
sonde a flame
MOTOR
YL
CONTROL
1168-1
MOTOR/moteur
interrompée
VALVE/soupappe
CELL
CAD
BECKETT OIL
PRIMARY
CONTROL
RD
CONTROL
1158-1
WH
THERMOSTAT CONNECTIONS/
raccorde du thermostat
L
RD
AL AL
BK
ECM MOTOR
(IF AVAILABLE)
INDOOR
YL
HEAT
CONT
EAC
COOL
2
principale
ventilateur
43213
BLOWER
MOTOR
INDOOR
BELT DRIVE MOTOR
(IF AVAILABLE)
N
MOTOR
L1
1
BURNER
ventilateur
principale
moteur
BLOWER
UNUSED
WH
ventilateur a courroie
(si disponible)
240005212 Rev A
ventilateur a ECM
(si disponible)
1168-1
CONTROL
1158-1
CONTROL
BK
INTERRUPTED/
BECKETT AFII BURNER/brûleur
THERMOSTAT CONNECTIONS/
raccorde du thermostat
T2
(disjoincteur avec fusible sur le fil d'alimentation)
18
Direct Vent Burner Wiring Diagram
O4HD-091A-14-FA-DV
OPERATION OF OIL BURNER
Once the furnace flue pipe, electrical and oil line
connections have been made, use the following
instructions to set the burner:
Shut off the electrical power to the furnace.
Install an oil pressure gauge to the pressure port on
the oil pump. (Refer to the oil pump specification sheet
included with the burner instructions).
Restore electrical power to the furnace.
Start the furnace and bleed all air from the fuel oil
lines.
Close the purge valve and fire the unit.
Allow the furnace to warm up to normal operating
temperatures. During this time, set the pump pressure
in accordance with the data provided in Appendix A,
Table A-2, and A-5.
When the furnace has reached "steady state" (after
approximately 10 minutes). Set combustion air damper
to get a TRACE of smoke.
Check the system temperature rise. The temperature
rise is the difference between the return air temperature
measured at a point near the return air inlet, and the
supply air temperature measured near the furnace
outlet. The system temperature rise is listed on the
furnace rating plate. If the temperature rise is too high,
the airflow must be increased. If the temperature rise is
too low, the fan should be slowed down.
Turn off the burner. Observing the duct thermometer in
the supply air stream, note the temperature at which
the blower fan stops. The fan adjustments can be
made by moving the dipswitch settings on the timer
control board for fan off delay.
To check the operation of the limit switch, shut off
power to the furnace. Temporarily remove the neutral
wire from the direct drive blower motor. Restore the
electrical power to the furnace and set the thermostat
above room temperature. After three or four minutes of
burner operation, the limit control should turn the
burner off. When the limit function test is complete,
shut off electrical power to the furnace, replace the
neutral wire to the blower fan motor, and then restore
power. The blower fan will start up immediately. Once
the temperature has dropped and the limit control has
reset, the fan will operate until the fan off time is
achieved. The oil burner will then resume operation
and continue until the thermostat is satisfied. Restore
the thermostat setting to a comfortable temperature.
Set the heat anticipator adjustment in the thermostat (if
so equipped), by removing the "R" or "W" wire to the
thermostat, then reading the amperage draw between
the two wires. Failure to remove one of the wires from
the thermostat while performing this test could burn out
the heat anticipator. Set the heat anticipator to the
amperage measured.
NOTE: THE FURNACE SHOULD BE RUN
THROUGH AT LEAST THREE FULL CYCLES
BEFORE LEAVING THE INSTALLATION, TO
ENSURE THAT ALL CONTROLS ARE
OPERATING PROPERLY AND AS EXPECTED.
NOTE: ALL JOINTS IN ANY POSITIVE
PRESSURE VENTING SYSTEM MUST BE
CHECKED FOR LEAKS BEFORE LEAVING
THE INSTALLATION SITE.
19
APPENDIX C OIL PRIMARY CONTROL DETAILED SEQUENCE OF OPERATION
Power is applied to unit. The oil primary control completes a self-diagnostic procedure. If no light or flame is present,
and unit passes its self-diagnostic procedure, the control enters into the idle mode.
Thermostat calls for heat:
A) Safety check is made for flame (4 second delay).
1) If flame is not present, the oil primary control will apply power to the burner motor and igniter.
2) If flame is present, the control remains in the idle state.
B) Unit enters a pre-purge period of 15 seconds.
C) After 10 seconds, control checks for flame presence.
1) If flame is not present, the oil primary control enters the trial for ignition state.
2) When flame is present, the control enters lock out mode.
D) The Oil Primary Control monitors the burner flame.
1) When flame is present, the control enters ignition carryover state. (Continues to spark for 10 sec.).
a) Provides continuous spark after flame is sensed to assure that burner remains lit.
b) Turns on LED diagnostic light.
c) Starts carryover timer.
(i) Flame and call for heat are monitored.
• If flame is lost and lockout timer has not expired, the control will return to trial for ignition state.
• If flame is lost and lockout timer has expired, the control will enter the recycle state.
♦ Recycle timer starts.
♦ Burner motor and igniter and solenoid valve are turned off.
♦ LED diagnostic light flashes slowly.
E) Carryover timer expires.
1) Enters run state.
a) Igniter turns off.
Combustion continues until thermostat is satisfied, or the oil primary control detects a loss of flame and enters into
Recycle Mode.
F) Thermostat is satisfied - call for heat is terminated:
a) Oil primary control shuts off burner motor and solenoid valve.
(i) If the control utilizes a blower motor off delay, after 30 seconds, flame presence is checked.
• If flame is not present, the control LED diagnostic light is off and returns to idle state.
• If flame is presence is detected, the control enters lock out mode.
20
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Broan O4HD-091A-12-FB Installation guide
- Type
- Installation guide
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